Metal-filament electric glow-lamp.



H. KUEL.

METAL FILAMBNT BLBGTBIO GLOW LAMP. APPLIoAToN FILED Nov. 24, 190B.

912,247. I PatentedFeb. 9,v 1909.

y 51% 9 5X/wm Avica/vars To all whom it may concern: i

UNITED vsinergias PATENT oEEioE.

HANs nUZEL, oF- BADEN, NEAR v1ENNA, AUSTRIA-HUNGARY.

mlTAuL-FILAMENT ELECTRIC GLOW-LAMP.

specification of Letters Patent. Application filed November 24,'1908. Serial No.'464,3 2 3.

Patented Feb. 9, 190e.

Be it known that L HANS KUZEL, a sub,- ject -of the Emperor of Germany, and a resident. of Villa Sirius, Baden, near Vienna, Empire of Austria-Hungary, chemist, have invented certain new 'and useful Improve' ments in Metal-Filament Electric Glow-.

L fampsfof which the following is a full, clear, and exact description.

etal filament electric glow lampsare already known in which` Contact between the iilaments is prevented by a sort of posia Y n. occupy a certain strai ht or bent posltlon.-

In manufacturing such amps it was observed ,that Asome filament legs showed a curvature differing from 'that of the others and were under an uncommon deiecting strain even before throwing the lamp into circuit. Also they proved to be under a tension whichvwas so near the limit of elasticity that these legs broke likean over loaded steel spring when for instance the lamp was laid down' somewhat indelicately. The breaking of the filaments also happened very frequently without any perceptible outer cause. The sai'd inconvenience occurred' mo11e'-' artic# ularly when the filaments were use( inl a helically Wound state. made Withrespect to these'conditions led to the result .that the cause of the said occurrences was found to be in the ununiform curvature of the bight of the filaments. Also it was found 'that the above mentioned detrimental excess of-tension is readily avoided by impartingto the hight, of the iilament a straight or slightly. curved almost straight The experiment s,

outline having corners, which outline can be obtained uniformly under any conditions.

,' The simplest case ofcarrying into eiect the present invention is -represented by the connection of the two legs of the iilament by a straight part at right angles. Such a filament is shown in Figure "1; c and b are the, legs, c 1s tlie straight connection replacing the bight 'heretofore in use. :At vac and y there are .the right angles..` Instead ofthe' right angles there maybe at x and y anv acute and an obtuse angle. Also lthe sum of the angles a: and may be4 more or less than 186. 'Also'the bight of the filament having a-straight or slightly curved outline may be given any polygonal and if desired-'also unsyninietrical shape selected to suit the conditions of tension. Such a filament is shown in Fig. 2;`a and b are the legs `of the iilament 0,11, c form the outline of vthebignt.l

l In Fig. 3 a lamp in accordance With the present` invention is shown. The lefthand side of the lower portion ofthedamp shows two filamentsI according to Fig. l; the right hand side shows two llaments according to Fig. 2.

Claim. In a metal filament electric glow lamp. the combination of iilaments and means 4for supporting them in the bulb eachof said laments comprising two legs and a bight por# tion connecting the same, .the *out lines of, such bight portions consisting of substan.

tially straight lines, meeting at angles, substantially as and for the purpose described.

In testimony whereof I have signed my name to this specification, in the presence of twosubscribing witnesses.

v HANS KUZEL. -Witnesses: s y

ROBERT W. HEINGARTNER,

AUGUST FUGGER.' 

